CYSYM File

What are CYSYM files and how to open them

Are you having problems opening a CYSYM file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your CYSYM files.

What is a CYSYM file?

A .CYSYM file is a Cypress PSoC Top-level Creator Symbol file.

Cypress PSoC Top-level Creator Symbol files store schematic symbol drawings for custom components created in the PSoC Creator IDE. These files define how a component appears in the schematic editor: the graphic shape, its terminals (pins), and the default instance name used when the component is dropped onto a design. They are part of creating or importing a Component, where a user can draw or use a wizard to make the symbol, set its terminals' names and types, optionally set a symbol label or title color, and specify how it shows in the Component Catalog.

PSoC Creator writes these files during component development. The symbol-file works together with other component files: an internal schematic (.cysch) defines the logic or hardware, source files provide the API, and this symbol file provides the visual representation. Other tools or the firmware do not directly edit it, but they reference its contents when you place or view a component in a project.

Inside the file, there is a binary header signature including a fixed byte-pattern at offset zero (for example, 84 1C 04 00… etc), and it contains strings such as "CYDESIGNER", "COMMON BASE", "CYARCHIVE VERSION", and "CYSYMBOL" which help identify its format.

How to open CYSYM files

Important: Different programs may use files with the CYSYM file extension for different purposes, so unless you are sure which format your CYSYM file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: September 21, 2026

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about CYSYM file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.